Since the last update both of the remaining eggs have been lost. By about 5:30pm yesterday the 3rd egg had been removed from the nest by the falcons. The fourth remained and appeared to have pipped. The female settled down to incubate the egg overnight and we were hopeful that the remaining egg might still be viable.
As of about 6:15 am this morning the fourth egg had also been removed. We are unsure what may have led to the failure of this clutch. There are many plausible causes and we simply don't have enough information at this point to speculate. This morning eggshell fragments and a sample of the gravel from the scrape were retrieved for lab analysis.
We will continue to monitor and evaluate the nest site. There is still the possibility that the falcons will have second brood. We will update you as information becomes available.